The topic below mine is about having Supergirl in the new films. Yet, theres one that'll be easy to bring in and that's Superboy. Think about it: Luthor has been pisted off that Superman returned and his life, before Superman left, is back and he's facign defeats again. So he would want his own Superman and bring the spotlight back to himself in his own way. So he clones Superboy. Plus, you also introduce Cadmus as they're existing, even now, in these times. Would make sense to have Cadmus keeping an eye out for Superman in today's dangerous time.